The Volvo VN truck tractor 
has been produced since 1996 with various modifications and changes, designated as 
VNL , VNM, VHD, etc. In our article, we will present a description of the Volvo VNL fuses and relays with a block diagram and its location. Note the cigarette lighter fuse.

Fuse and relay box

All Volvo VN models have a common location of the main fuse and relay unit, in the central part of the panel. To access it, you need to remove the protective cover.

The block itself will look something like this:

Check the assignment of fuses and relays with your diagram located on the back of the protective cover or other technical documentation.

No.Description of fuses
1control unit on the driver’s door (locks, windows, mirrors)
2radio, cd, amplifier
3Driver’s window lift and heated mirror
4passenger window lift
5steering column control module
6additional equipment (accessory expansion)
7not used
8Power Supply #1 Light Control Module (LCM)
9trailer lighting, trailer marker relay
10Power Supply #2 Light Control Module (LCM)
11Battery/Volvo Link
12road relay/battery
13diagnostic connector
14qualcom
15ignition key terminal “B”
16ignition key terminal “30”
17Power Supply #3 Light Control Module (LCM)
18trailer parking relay
19backlight in battery compartment
20Battery discharge protection module
21Cummins Engine DR
22fuel filter
23climate control backlight
24instrument panel
25heated seats
26wipers
27differential lock
28wheel lock
29camera preparation / Body Builder Ignition Z
30electric driver’s seat
31Electric passenger seat
32ignition expansion
33Snowplow Lights LH
34central tire inflation
35RH Snow Plow Lights
36cigarette lighter
37cabin lighting
38–
39radio station
40suspension (ECS)
41air horn
42Power Supply #5 Light Control Module (LCM)
43trailer stops, relay
44Power Supply #6 Light Control Module (LCM)
45electric sound signal
46constant (non-switchable) power supply for radio and devices
47Main power supply for heater/air conditioner fan
48central locking
49AUX1
50AUX2
51AUX3
52Battery discharge protection module
53additional 12 volt socket
54additional non-switchable power supply
55–
56air dryer, brakes
57airbag (SRS)
58lifting axles / body reverser
59qualcomm / Inside/Outside Air
60road relay / body builder Ign-Y/Ing. Exp.
61ABS
62ABS
63suspension
64fifth wheel lock
65Light Control Module (LCM)
66body builder Ign-X
67coolant pump VED16
68central locking
69additional nutrition
70Vorad/ECS
71not used
72ignition for the box – automatic
73ICON only with Cummins
74radio with icon/amplifier
75PTO power take-off box
76Jake Brake, Engine Brake, Exhaust Brake
77Allison D.R.
78Allison Battery
79EMS A
80EMS B/ Deairation Sw
81EMS System/VECU
82Body Builder module
90Fuel pump
91
92Indoor lamps

Fuse number 36 is responsible for the operation of the cigarette lighter.

No.Relay designation
1RELAY.DR
2RELAY. TRAILER PARKING
3RELAY. TRAILER-STOP
4RELAY. EMS
5RELAY. LIFT AXLE / REVERSE SIGNAL
5ARELAY. Temp. Start DR
6ARELAY. Temp. Start IGN
7RELAY. PTO
9RELAY TRAILER MARKER
10RELAY. CITY SIGNAL
11RELAY. Interior lighting / DOOR LIGHTS
12RELAY. INTERMITTENT WIPER
13RELAY. AUTO-BIAS
13_1RELAY. ALLISON START ON
14RELAY. ALLISON AUTO-NEUTRAL
14_1RELAY. Parking brake TAS
15RELAY. ALLISON POWER
16RELAY. BODY BUILDER REMOTE THROTTLE INC.
17RELAY. BODY BUILDER REMOTE THROTTLE DEC.
18RELAY. ALLISON SERVICE BRAKE INPUT
20RELAY. ALLISON BODY BUILDER1
21RELAY. ALLISON BODY BUILDER2
26SNOW MACHINE LH ER8
27SNOW PLAW RH ER9
28SNOW ENTRY LCM INPUTER7
29POWER RELAY 1 BATTERY
30POWER RELAY 2 IGNITION
31POWER RELAY 3 IGNITION
32POWER RELAY 4 ACCESSORIES
33Relay. ER9 Motorized Mirror IN
33ARelay. ER8 Motorized Mirror OUTPUT
34ER8 ECS Rower
35MEIR ER3
36Relay. ER7 Electric window lifter “UP”
37Relay. ER6 Electric window lifter “DOWN”
38Roof marker lights ER2
39Sleeper HVAC Relay on Wiring Harness
40RELAY STARTER ENGINE
41RELAY. PARKING BRAKE
42ENGINE WARM-UP RELAY
43Relay, Shunt
44Battery Protection Relay ER8